WO2007062612A1 - Überwachungseinheit zur lastüberwachung eines elektrischen motors - Google Patents
Überwachungseinheit zur lastüberwachung eines elektrischen motors Download PDFInfo
- Publication number
- WO2007062612A1 WO2007062612A1 PCT/DE2005/002152 DE2005002152W WO2007062612A1 WO 2007062612 A1 WO2007062612 A1 WO 2007062612A1 DE 2005002152 W DE2005002152 W DE 2005002152W WO 2007062612 A1 WO2007062612 A1 WO 2007062612A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- motor
- load
- monitoring
- monitoring unit
- indication
- Prior art date
Links
- 238000012544 monitoring process Methods 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 claims description 14
- 230000001681 protective effect Effects 0.000 claims description 7
- 230000000977 initiatory effect Effects 0.000 claims description 2
- 238000011156 evaluation Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 238000003745 diagnosis Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000007620 mathematical function Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
Definitions
- Monitoring unit for monitoring the load of an electric motor
- the invention relates to a monitoring unit and a method for monitoring the load of an electric motor.
- Such a monitoring unit or method is used in conjunction with motors and drives, especially for drives and motors that are integrated in automation systems.
- Such a monitoring unit can be carried out, for example, as an electronic monitoring relay.
- the monitoring unit has a measuring unit which measures a load-relevant variable. Furthermore, the measured variable is evaluated by means of an evaluation unit to the effect that a monitoring of a load, for example, a motor or a drive is guaranteed.
- a load-relevant variable represents, for example, the motor current I or the power factor cos ⁇ of a drive or an engine.
- threshold values for the load-relevant variable are set in the load monitoring relays and a switching relay is actuated when they are undershot or exceeded.
- the power factor cos ⁇ can serve as a load-relevant variable, where ⁇ represents the phase angle between the supply voltage of the drive and the motor current flowing in the process.
- the power factor cos ⁇ can then be monitored by means of preset thresholds. The setting of a tolerance range is also possible.
- the motor current is used as a load-relevant size for monitoring.
- the load-relevant variable is usually set in relation to the torque of the motor. In this way, a direct assignment of the load-related variable is given to a torque of the motor. In this way, the load-relevant variable acts as an indication of the current torque of the engine.
- it is desirable if the ratio of the load-relevant variable to the torque is linear in as many torque ranges as possible. Unfortunately, this is usually not the case. Regardless of which size is selected as the load-relevant variable, the ratio of the load-relevant variable to the torque of the motor is by no means linear. As a result, a faulty calculation of the load-relevant variable takes place in very specific torque ranges.
- the load-relevant size is therefore no longer suitable for load monitoring of the motor or the drive. Consequently, when defining the tolerance range or the definition of the thresholds, one is limited to very specific torque ranges. A linearization of the load-relevant size over the entire torque range would allow free tolerance range or threshold selection.
- FIG. 1 shows load-relevant variables such as the already mentioned motor current and the cosine of the phase angle ⁇ plotted against the torque of an engine.
- the curve K1 with the corresponding scale in amperes on the right-hand side is relevant.
- this load-relevant variable shows a substantially linear course. With smaller torques, this curve flattens out noticeably, thus reducing the expressiveness or decision force that is given when using the motor current as a load-relevant variable.
- curve K2 is relevant.
- the associated vertical axis is on the left side of the graph. In this case, the load-relevant size ranges from 0 to 1.
- an additional logic such as a programmable logic controller PLC, necessary if after the application of the mains voltage electrical integration of Lastüberwachungs- relay is to be implemented before the contactor in the motor branch. It is desirable that the load monitoring relay in a motor feeder is also electrically connected before the on / off contactor without additional logic. For this, it is necessary that the start-up bridging time for the drive is only started by the beginning of the current flow. Since the detection of the motor current is not possible for very small currents, it is always necessary to use additional additional logic.
- PLC programmable logic controller
- an electronic relay which has a size based on the phase angle by means of an ner measuring unit isolated and used for load monitoring by means of a microprocessor.
- the object of the invention is to specify a monitoring unit for monitoring the load of an electric motor, threshold values of the monitoring being linearly adjustable practically over the entire torque range of the motor.
- This object is achieved in a monitoring unit of the type mentioned above in that the ⁇ berwachungsaku is provided for detecting a motor current and a phase angle between the supply voltage and the motor current in the operating state of the engine, and means for forming an indication size from the motor current and the phase angle as a measure of Monitoring the electrical load of the engine has. Furthermore, this object is achieved by a method of the aforementioned type, wherein a motor current and phase angle between the supply voltage and the motor current in the operating state of the engine are detected and an indication variable from the motor current and the phase angle is formed as a measure for monitoring the electrical load of the motor becomes.
- the monitoring unit detects both a motor current and the phase angle between the supply voltage and the motor current. After detection, both variables are further processed in an evaluation unit, or functions or indication variables are formed based on the detected motor current and phase angle.
- the monitoring unit has means for forming an indication variable from the motor current and the phase angle.
- the indication size is based here on the motor current and the phase angle, whereby both detected quantities are processed for this purpose, for example, by further mathematical or electrical functions.
- the indication size is used as a measure for monitoring the electrical load of the motor.
- the indication size is chosen such that the dependency the indication size for the torque or load of the motor is linear.
- the means for forming an indication variable for continuous adaptation to the characteristic properties of the motor to be monitored can be adapted. An active linear adjustment of the indication size is thus possible for further optimization or for adjustment to different motors or drives.
- a further advantageous embodiment of a monitoring unit for load monitoring uses an indication variable which is formed from the product of the motor current with the cosine of the phase angle. Since both load-relevant variables work differently well in different load or torque ranges, a compensation effect achieves a linearization through the use of this product of motor current with the cosine of the phase angle. Furthermore, combinations of other load-relevant variables are conceivable, which leads to a linearization of the ratio of the indication variable to the torque or the load by means of a mutual compensation effect.
- the indication variable can be formed from a product of a first function, which is formed from the motor current, and from a second function, which is formed from the phase angle.
- the detected load-relevant variables motor current and phase angle can be further conditioned by means of a first and / or a second function such that the linear adaptation is further optimized.
- a further linearization ensures that a direct reference of the indication size to the current engine load is ensured.
- the monitoring unit is intended to initiate at least one protective measure if at least one threshold value and / or a tolerance range of the integration variable is exceeded or violated.
- This procedure is conventional, but in conjunction with the line Arized indication variable torque curve leads to a better adjustability of the threshold values and thus to a more direct monitoring of the motor.
- the linearized characteristic extends the monitoring range of the engine from very low inrush currents to high motor currents when driving a peak load.
- the monitoring unit Due to the extended detection range and a wide-voltage supply, a universal application possibility for the monitoring unit results. Furthermore, the monitoring unit here comes out without an additional logic circuit, in the form of a PLC, when the monitoring unit is arranged electrically in front of the contactor in the motor feeder. This has positive effects, which are noticeable in other devices.
- the voltage supply for the monitoring unit can not only be designed with a rated voltage with tolerance (for example AC 400 V, + 10%), but a wide-voltage version with a working range of, for example, AC 90 to AC 690 V can be realized.
- FIG. 2 shows a block diagram of an embodiment of a monitoring unit.
- FIG. 1 shows a graph showing possible indication variables as a function of the torque of an engine.
- the left vertical axis can be seen in conjunction with the curve K2, which is based on an indication size based on the cosine of the phase angle.
- the curve K2 behaves almost linearly at low torques of the engine, but flattens out noticeably at medium and higher torques and makes reliable control or reliable initiation of protective measures impossible.
- FIG. 1 it can be seen that starting at approximately 75% of the rated motor torque (indicated by the vertical bar printed in bold), possible monitoring is no longer possible. This means that the remaining 25% of the torque range can not be monitored.
- the graph of FIG. 1 also shows the curve K1, which represents an indication variable as a function of the torque, which is based on the motor current.
- curve K the right vertical axis is relevant. If the motor current is selected as the basic variable for the indication size, there is no linear relationship between the indication size and the torque of the motor at low torques. The correct setting of the threshold values or tolerance ranges is therefore only possible to a limited extent. Again, a limitation of the surveillance area is acceptable.
- an indication variable is proposed in this embodiment, which is formed from the size of the motor current in combination with the size of the phase angle.
- the indication variable consists of the product of the motor current with the cosine of the phase angle.
- the indication variable according to the invention is shown in the graph of FIG. 1 in the form of curve K3.
- the right vertical axis is relevant in connection with K3. It can clearly be seen that the problem areas of the indication sizes, which only go back to one of the two load-relevant quantities, were compensated. It is a nearly linear one Ratio of the indication size to the torque of the motor or drive has been realized, with no problem areas occur. In this way, it is possible to establish thresholds or tolerance ranges over the entire torque range, without the direct relationship between the indication variable and the torque having a negative effect on the load monitoring.
- linearization for example, a V-belt crack, a pump idle, the load on a conveyor belt or a tool wear can be detected in good time.
- the monitoring unit 1 has two phase connections A1 and A2, which are provided for the electrical connection to one phase of a multi-phase power supply network 11.
- the motor 2 to be monitored is in this case connected on the one hand to one of the phases of the power supply network 11 and on the other hand to the terminal A3 of the monitoring unit 1.
- the monitoring unit 1 is designed as a two-phase device.
- the circuit in which the to be monitored is designed as a two-phase device.
- the circuit in which the to be monitored is designed as a two-phase device.
- the phase connections A1 and A2 can be connected, for example
- Engine 2 is partially passes through the monitoring unit 1.
- the motor 2 is not only connected to the phase Ll, but also connected via the monitoring unit with the phase L2.
- a current sensor 3 By means of a current sensor 3, the motor current of the motor 2 is measured.
- the current sensor 3 can hereby be ausckle- as a current transformer, ⁇ which tracks the motor current to a voltage Interwall. This illustrated voltage is transmitted via a line to the measuring and evaluation unit. forwarded.
- the measurement and evaluation unit 8 is further connected to the phases L1 and L2 and is thus able to detect the motor current and the phase angle between the motor current and the supply voltage.
- the measuring and evaluation unit 8 can be realized, for example, from a controller with the associated periphery.
- the measuring and evaluation unit 8 is supplied with voltage by the voltage regulation 5.
- the voltage regulator 5 contains a switching regulator 6 and a high-voltage stage 7.
- the voltage regulator 5 is supplied with DC voltage by a rectifier, for example a bridge rectifier.
- a rectifier for example a bridge rectifier.
- the measuring and evaluation unit 8 an evaluation of the measured quantities and / or a preliminary analysis takes place.
- the measuring and evaluation unit 8 is able to perform by means of the switching stage 10, which contains at least one relay, a protective shutdown or protective intervention.
- the decision for a protective reaction is triggered based on the indication size / torque characteristic.
- an optimization of the indication size formation by means of the diagnosis and display unit 9 is possible.
- the diagnosis and display unit 9 can be executed, for example, as a control panel.
- the user can integrate motor-specific or application-specific characterizing features that are relevant for a safety shutdown or protection intervention into a characteristic curve. Changing a characteristic results in a change of the calculation method of the integration variable. It is important that this calculation is always based on both the determined motor current and also the determined phase angle.
- the invention relates to a monitoring unit for monitoring the load of an electric motor.
- the monitoring unit ensures monitoring of the engine load over the entire torque range.
- the monitoring unit uses a linearizing adaptation of the indication size.
- the monitoring unit for detecting a motor current and a .Phasenwinkels between supply voltage and the motor current in the operating state of Motors provided.
- this means for forming an indication variable from the motor current and the phase angle as a measure for monitoring the electrical load of the motor.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Electric Motors In General (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/085,521 US20090033265A1 (en) | 2005-11-29 | 2005-11-29 | Monitoring Unit for Monitoring the Load of an Electric Motor |
PCT/DE2005/002152 WO2007062612A1 (de) | 2005-11-29 | 2005-11-29 | Überwachungseinheit zur lastüberwachung eines elektrischen motors |
EP05816422A EP1969713B1 (de) | 2005-11-29 | 2005-11-29 | Überwachungseinheit zur lastüberwachung eines elektrischen motors |
AT05816422T ATE453951T1 (de) | 2005-11-29 | 2005-11-29 | Überwachungseinheit zur lastüberwachung eines elektrischen motors |
DE502005008802T DE502005008802D1 (de) | 2005-11-29 | 2005-11-29 | Überwachungseinheit zur lastüberwachung eines elektrischen motors |
DE112005003814T DE112005003814A5 (de) | 2005-11-29 | 2005-11-29 | Überwachungseinheit zur Lastüberwachung eines elektrischen Motors |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/DE2005/002152 WO2007062612A1 (de) | 2005-11-29 | 2005-11-29 | Überwachungseinheit zur lastüberwachung eines elektrischen motors |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2007062612A1 true WO2007062612A1 (de) | 2007-06-07 |
WO2007062612A8 WO2007062612A8 (de) | 2008-06-19 |
Family
ID=36627420
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2005/002152 WO2007062612A1 (de) | 2005-11-29 | 2005-11-29 | Überwachungseinheit zur lastüberwachung eines elektrischen motors |
Country Status (5)
Country | Link |
---|---|
US (1) | US20090033265A1 (de) |
EP (1) | EP1969713B1 (de) |
AT (1) | ATE453951T1 (de) |
DE (2) | DE112005003814A5 (de) |
WO (1) | WO2007062612A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2003771A1 (de) * | 2007-06-11 | 2008-12-17 | Société industrielle de Sonceboz S.A. | Sensorlose Regelung eines synchronen Permanentmagnetmotors in einem geschlossenen Regelkreis |
WO2013013792A3 (de) * | 2011-07-26 | 2013-07-25 | Sew-Eurodrive Gmbh & Co. Kg | Antriebssystem und verfahren zum betreiben eines antriebssystems |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1772960B1 (de) * | 2005-10-07 | 2009-03-04 | Emotron AB | Lastüberwachung |
ES2616236T3 (es) * | 2010-10-20 | 2017-06-12 | Philips Lighting Holding B.V. | Aparatos de desagregación |
DE102018101180B4 (de) * | 2018-01-19 | 2019-10-10 | Rovema Gmbh | Verfahren zum Betrieb einer Verpackungsmaschine |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0632283A1 (de) * | 1993-06-29 | 1995-01-04 | Liberty Technologies, Inc. | Methode und Apparat zur Analyse von mehrphasigen elektrischen Motorsystemen |
US5689194A (en) * | 1996-04-19 | 1997-11-18 | Framatome Technologies, Inc. | Acoustic motor current signature analysis system with audio amplified speaker output |
US6430518B1 (en) * | 1999-08-11 | 2002-08-06 | Fps, Inc. | Method and apparatus for monitoring performance of multiple electrical loads from a single source |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5651667A (en) * | 1991-10-11 | 1997-07-29 | Helix Technology Corporation | Cryopump synchronous motor load monitor |
-
2005
- 2005-11-29 US US12/085,521 patent/US20090033265A1/en not_active Abandoned
- 2005-11-29 DE DE112005003814T patent/DE112005003814A5/de not_active Withdrawn
- 2005-11-29 EP EP05816422A patent/EP1969713B1/de not_active Not-in-force
- 2005-11-29 AT AT05816422T patent/ATE453951T1/de not_active IP Right Cessation
- 2005-11-29 WO PCT/DE2005/002152 patent/WO2007062612A1/de active Application Filing
- 2005-11-29 DE DE502005008802T patent/DE502005008802D1/de active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0632283A1 (de) * | 1993-06-29 | 1995-01-04 | Liberty Technologies, Inc. | Methode und Apparat zur Analyse von mehrphasigen elektrischen Motorsystemen |
US5689194A (en) * | 1996-04-19 | 1997-11-18 | Framatome Technologies, Inc. | Acoustic motor current signature analysis system with audio amplified speaker output |
US6430518B1 (en) * | 1999-08-11 | 2002-08-06 | Fps, Inc. | Method and apparatus for monitoring performance of multiple electrical loads from a single source |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2003771A1 (de) * | 2007-06-11 | 2008-12-17 | Société industrielle de Sonceboz S.A. | Sensorlose Regelung eines synchronen Permanentmagnetmotors in einem geschlossenen Regelkreis |
WO2013013792A3 (de) * | 2011-07-26 | 2013-07-25 | Sew-Eurodrive Gmbh & Co. Kg | Antriebssystem und verfahren zum betreiben eines antriebssystems |
Also Published As
Publication number | Publication date |
---|---|
WO2007062612A8 (de) | 2008-06-19 |
EP1969713A1 (de) | 2008-09-17 |
EP1969713B1 (de) | 2009-12-30 |
US20090033265A1 (en) | 2009-02-05 |
DE112005003814A5 (de) | 2008-10-30 |
DE502005008802D1 (de) | 2010-02-11 |
ATE453951T1 (de) | 2010-01-15 |
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